package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import com.thoughtworks.xstream.XStream;

public class GroupDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length < 3) {
		System.out.println("Please specify parameters: <amount of test data> <file> <format>");
		return;
		}
		int amount = Integer.parseInt(args[0]);
		File file = new File(args[1]);
		String format = args[2];
		
		if (file.exists()){
			System.out.println("File exists, please remove it manually: " + file);
		}
		
		List<GroupData> groups = generateRandomGroups(amount);
		if ("csv".equals(format)){
			saveGroupsToCsvFile(groups, file);	
		} else if ("xml".equals(format)){
			saveGroupsToXmlFile(groups, file);
		} else {
			System.out.println("Unknown format: " + format);
			return;
		}
	}
	
	public static List<GroupData> loadGroupsFromXmlFile(File file) {
		XStream xstream = new XStream(); 
		xstream.alias("group", GroupData.class);
	    return (List<GroupData>) xstream.fromXML(file);
}


	private static void saveGroupsToXmlFile(List<GroupData> groups, File file) throws IOException {
			XStream xstream = new XStream(); 
			xstream.alias("group", GroupData.class);
		    String xml = xstream.toXML(groups);
		    FileWriter writer = new FileWriter(file);
		    writer.write(xml);
		    writer.close();
	}

    public static List<GroupData> loadGroupsFromCsvFile(File file) throws IOException {
    		List<GroupData> list = new ArrayList<GroupData>();
    		FileReader reader = new FileReader(file);
    		BufferedReader bufferedReader = new BufferedReader(reader);
    		String line = bufferedReader.readLine();
    		while (line != null){
    			String[] part = line.split(",");
    			GroupData group = new GroupData()
    				.withGroupName(part[0])
    				.withHeader(part[1])
    				.withFooter(part[2]); 
    			list.add(group);
    			line = bufferedReader.readLine();
    		}
    		bufferedReader.close();
    		reader.close();
			return list;
	  }
    
    
	private static void saveGroupsToCsvFile(List<GroupData> groups, File file) throws IOException {
			FileWriter writer = new FileWriter(file);
			for(GroupData group : groups){
				writer.write(group.getGroupname() + "," + group.getHeader() + "," + group.getFooter() + ",!" + "\n");
			}
			writer.close();
	}

	public static List<GroupData> generateRandomGroups(int amount) {
		List<GroupData> list = new ArrayList<GroupData>();
		for(int i=0; i<amount; i++)
		{
			GroupData group =new GroupData() 
				.withGroupName(generateRandomString())
				.withHeader(generateRandomString())
				.withFooter(generateRandomString());
			list.add(group);
		}
		return  list;
	}
	
	public static String generateRandomString() {
		  Random rnd = new Random();
		  if (rnd.nextInt(3) == 0) {
				return "";
			} else {
				return "test" + rnd.nextInt();
			}
	 } 

}
